macos: restore paste semantics for dropped text (#13999)

Discussion #13979

Dropped paths and text once again honor bracketed paste mode. IME,
dictation, emoji picker, and character viewer commits remain typed
input.

sendText calls ghostty_surface_text, which applies the clipboard paste
pipeline and bracketed paste framing when enabled. Separating the paths
at the drag-and-drop caller preserves the input-method behavior
introduced by #13817.

macos/Sources/Ghostty/Ghostty.Surface.swift

@@ -44,8 +44,9 @@ extension Ghostty {
             }
         }
 
-        /// Send text to the terminal as if it was typed. This doesn't send the key events so keyboard
-        /// shortcuts and other encodings do not take effect.
+        /// Send text to the terminal using paste semantics. This doesn't send key events, so keyboard
+        /// shortcuts and other encodings do not take effect. Bracketed paste framing is applied when
+        /// the terminal has enabled it.
         @MainActor
         func sendText(_ text: String) {
             let len = text.utf8CString.count

macos/Sources/Ghostty/Surface View/SurfaceView_AppKit.swift

@@ -2305,10 +2305,7 @@ extension Ghostty.SurfaceView {
 
         if let content {
             DispatchQueue.main.async {
-                self.insertText(
-                    content,
-                    replacementRange: NSRange(location: 0, length: 0)
-                )
+                self.surfaceModel?.sendText(content)
             }
             return true
         }